03-04-2008 06:19 AM - edited 03-03-2019 08:57 PM
Hi all,
I am configuring 2 1760 connected back-to-back using a single T1. In order to support VoIP, I want to enable PPP multilink on the T1 for fragmentation. However when I enable PPP multilink on the T1 serial interface, the link goes down and the serial interface reports framing errors and resets. If I do not enable multilink the link is clean.
I searched the documentation and I cannot find anywhere that this setup is not supported. I am running the same setup between 2811 without errors.
Is there something I am missing?
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname pvgtwy4a
!
boot-start-marker
boot-end-marker
!
!
tdm clock T1 0/0 data import onboard internal
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
no aaa new-model
ip subnet-zero
ip cef
!
!
!
!
no ftp-server write-enable
!
!
!
!
!
!
!
!
!
!
!
!
!
!
controller T1 0/0
framing esf
linecode b8zs
cablelength short 133
channel-group 0 timeslots 1-24 speed 64
!
!
!
interface Multilink1
mtu 2000
ip address 10.255.255.2 255.255.255.252
max-reserved-bandwidth 100
ip route-cache flow
ip tcp header-compression iphc-format
ppp multilink
ppp multilink fragment delay 5
ppp multilink interleave
ppp multilink group 1
ppp multilink mrru local 2000
ppp multilink mrru remote 2000
ip rtp header-compression iphc-format
!
interface FastEthernet0/0
ip address 192.168.1.1 255.255.255.0
speed auto
full-duplex
!
interface Serial0/0:0
ip address 10.255.255.6 255.255.255.252
max-reserved-bandwidth 100
encapsulation ppp
ppp multilink
ppp multilink group 1
!
ip classless
!
no ip http server
!
!
control-plan
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname pvgtwy4b
!
boot-start-marker
boot-end-marker
!
tdm clock T1 0/0 both export line
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
voice-card 0
!
no aaa new-model
ip subnet-zero
ip cef
!
!
!
!
no ftp-server write-enable
!
!
!
!
!
!
!
!
!
!
!
!
!
!
controller T1 0/0
framing esf
linecode b8zs
cablelength short 133
channel-group 0 timeslots 1-24 speed 64
!
!
!
interface Multilink1
mtu 2000
ip address 10.255.255.1 255.255.255.252
max-reserved-bandwidth 100
ip route-cache flow
ip tcp header-compression iphc-format
ppp multilink
ppp multilink fragment delay 5
ppp multilink interleave
ppp multilink group 1
ppp multilink mrru local 2000
ppp multilink mrru remote 2000
ip rtp header-compression iphc-format
!
interface FastEthernet0/0
ip address 192.168.0.1 255.255.255.0
speed auto
full-duplex
!
interface Serial0/0:0
ip address 10.255.255.5 255.255.255.252
max-reserved-bandwidth 100
encapsulation ppp
ppp multilink
ppp multilink group 1
!
ip classless
!
no ip http server
!
!
control-plane
03-04-2008 06:26 AM
Can be an IOS anomaly issue.
Upgrade to latest 12.3 that is like 40 or so, remove all what not essential under multilink interface and try again.
03-04-2008 06:31 AM
I have upgraded already to the latest release of the train 12.3(11)T. I was running 12.3(11)T and upgraded to 12.3(11)T11 with the same result.
I get this error as soon as I enable PPP multilink on the serial interface, even if I do not specify which PPP multilink group...
03-04-2008 06:38 AM
Can you try 12.4(3j) that is the most stable release as of today ?
03-04-2008 07:00 AM
Paolo,
I'm curious about your suggestion. Since within a mainline release, changes are supposed to be limited to bug fixes, wouldn't, in theory, the very latest be the most stable?
Your original post would also seem to endorse using the latest.
03-04-2008 06:29 AM
BTW: depending on how much of the T-1's bandwidth you have, fragmention to support voice might be unnecessary.
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